Calculate the molality of the unknown compound (m). m=mol of solute X particles

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Calculate the molality of the unknown compound (m). m=mol of solute X particles per formation / mass of solvent , kg Data given: Mass of test tube , flask, t-butyl alcohol and unknown : 146 .42g Mass of test tube and flask: 139.53g Mass of t-butyl alcohol , test tube , and flask : 146:24g Mass of t-butyl alcohol : 6.71 g Mass of unknown : 0.18g Freezing Point of solution from cooling point: 29.3 C Freezing point depression caused by addition of the unknown to t-butyl alcohol.: -5.00C Show All work Please?

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